Centralize legacy document session bridge

src/legacy_document_session_services.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "app_core/document_session.h"
+#include "foundation/result.h"
+
+#include <functional>
+
+class App;
+
+namespace pp::panopainter {
+
+[[nodiscard]] pp::foundation::Status execute_legacy_close_request_decision(
+    App& app,
+    pp::app::CloseRequestDecision decision,
+    bool& dialog_already_opened);
+
+[[nodiscard]] pp::foundation::Status execute_legacy_document_save_decision(
+    App& app,
+    pp::app::DocumentSaveDecision decision);
+
+[[nodiscard]] pp::foundation::Status execute_legacy_document_workflow_decision(
+    App& app,
+    pp::app::DocumentWorkflowDecision decision,
+    std::function<void()> action);
+
+} // namespace pp::panopainter